does I smell nigra

It has nothing to do with black people, it has to do with him being an over-privileged douche who thinks he can do/say whatever he wants.

People are going to most likely associate his behavior to race, regardless of the fact it's only him being a douche, and not all black people. There was a reason Obama was really careful to never exhibit anger, lest he pushes the reputation of black people back a step. Celebrities of a certain ethnicity are essentially representing their race; it won't suddenly change everybody's opinions 100% whenever they do something, but it really helps.